Compound for artificial stone.



have invented a certain new and useful Imit pertains to make and use the same.

In making the stone I employ any of the well- :0 parts of sand using in addition to the sand,

2 5 ment are mixed with water in what is known or muddy condition.v In the water before it UNITED. STATES Patented August 25, 1903. PATENT OFFICE:

JAMES S. BURNS, OF ANN ARBOR, MICHIGAN, ASSIGNOR ONE-THIRD TO GEORGE P. GOODALE, OF DETROIT, MICHIGAN;

COMPOUND FOR ARTIFICIAL s'roNE.

Application filed February 9, 1903.

To all whom it may concern:

Be it known that I, JAMES S. BURNS, a citizen of the United States, residing at Ann Arbor, county of Washtenaw, State of Michigan,

provement in Compound for Artificial Stone; and I declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which This invention relates to artificial stone, brick, and building material, and has for its object an artificial-stone compound usefulfor any purpose for which stone may be used.

known brands of Portland cement, with sharp silicious sand mixed in the proportions ordinarily used in mixtures of cement and sand, generallyabout one part of cement to six however, a imes marble-dust, which gives the finished product a white glistening appearance and causes it to simulate to a certain extent white marble. The sand and ceas a dry mixture--that is, no more water is used than is sufiicient to moisten it thoroughly without bringing it to a creamy or semiliquid,

srncrrrcarron forming part of Letters Patent No. 737,334, dated August 25, 1903.

Serial No. 142,685- (No specimens.)

immediately removed, as it sets at once. It is then allowed to dry, and during the curing is from time to time washed with diluted nitric acid.

e proportions given above are not absolute, but are approximate and may be varied within reasonable limits without serious detriment to the product; but the proportions given have been found to give the best results. Any mineral coloring-matter may be added. The proportions of quantities cannot be given more than approximate, because all of the elements as they are found in nature and in commerce differ more or less. Neither the sand nor the Portland cement are uniform, and allowance must be made because of such want of uniformity. The nit-ric acid used to wash the product during the process of curing acts to form colloidal silica with the sodium silicate for a short distance in from the surface, producing a chemical reaction with some of the materials and forms a waterproof coating around the stone which extends into the stone for a short distance and prevents the subsequent leaching out of any of the soluble salts therein.

\Vhat I claim is- An artificial stone composed of Portland soda which have been dissolved silicate o co er salt, sulfuric and hydro luoric acld the proportions specified, and 11 Wine 1s 1d in suspension litharge inthe proportions 7 5 ecified, the said stone being treated while uring with a wash of diluted nitric acid, ubstantially as specified;

In testimony whereof I sign this specifica- 30 is used is dissolved silicate of soda, copperas,

. litharge, salt, and sulfuric acid in the proportion of about eight (8) pounds of silicate of soda 'four (4) pounds of co eras and live 7 lo; pounds of salt to fifty gallons of 3 5. water and in t e so ution is mixed about two 2; pounds of lithar e which isstirred and kept insus'pension while the liquid is using. To this mixture is added forty (40) gallons of ion in the presence of two witnesses. water containing one per cent. of sulfuric and JAMES S. BURNS.

1 0 one per centiof hydrofluoric "acid 'Il 1e ce- Witnessesz' K I ment materialmois ene w1 e iquid comf: LOTTA LEE HAYTON,

' pound is plac'ed in molds, when' -it may be. MAY E. Kor'r. 

